On 2025-12-10 17:12, brin solomon wrote:
>
From how I read the above thread, it sounds like there's a proposed
change to have { \compoundMeter #'(2 3 8) c8 c c c c } as well as
{ \compoundMeter #'((2 8) (3 8)) c8 c c c c } produce, with default
settings, a bar with five eighth notes where the first two are unbeamed
and the last three are beamed together. Is that correct?
Correct, but imprecise. There are parts that should be understood
separately.
I. Beaming a strictly alternating time signature, (A/B) + (C/D)
The first part of the measure is beamed with the settings for A/B, and
the second part of the measure is beamed with the settings for C/D.
LilyPond 2.24 got this wrong and 2.25 gets it right. [1]
II. Beaming a time signature with a subdivided numerator, (A+B)/D
LilyPond 2.25 still does what it has long done: structure by the user's
subdivision (A, B). Werner has proposed changing this to match the new
treatment of (A/D)+(B/D).
III. Beaming a basic time signature
For 2/8, _Behind Bars_ shows two unbeamed eighths (p. 155, middle of
third line), but allows beaming under certain conditions (p. 154).
LilyPond by default leaves the two eighths unbeamed.
Users who do not like the default settings can change them with
\overrideTimeSignatureSettings or advocate changing the defaults.
Depending on the time signature, changing the settings might bump up
against issues similar to those discussed in #6828. [2] Those ought to
be considered carefully before changing any defaults.
[1] https://gitlab.com/lilypond/lilypond/-/issues/6789
[2] https://gitlab.com/lilypond/lilypond/-/issues/6828
--
Dan
